<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js light">
    <head>
        <!-- Book generated using mdBook -->
        <meta charset="UTF-8">
        <title>Page not found - Discovery</title>
        <base href="/">


        <!-- Custom HTML head -->
        
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
        <meta name="description" content="Discover the world of microcontrollers through Rust">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="theme-color" content="#ffffff" />

        <link rel="icon" href="favicon.svg">
        <link rel="shortcut icon" href="favicon.png">
        <link rel="stylesheet" href="css/variables.css">
        <link rel="stylesheet" href="css/general.css">
        <link rel="stylesheet" href="css/chrome.css">
        <link rel="stylesheet" href="css/print.css" media="print">

        <!-- Fonts -->
        <link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
        <link rel="stylesheet" href="fonts/fonts.css">

        <!-- Highlight.js Stylesheets -->
        <link rel="stylesheet" href="highlight.css">
        <link rel="stylesheet" href="tomorrow-night.css">
        <link rel="stylesheet" href="ayu-highlight.css">

        <!-- Custom theme stylesheets -->
        <link rel="stylesheet" href="custom.css">

    </head>
    <body>
        <!-- Provide site root to javascript -->
        <script type="text/javascript">
            var path_to_root = "";
            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
        </script>

        <!-- Work around some values being stored in localStorage wrapped in quotes -->
        <script type="text/javascript">
            try {
                var theme = localStorage.getItem('mdbook-theme');
                var sidebar = localStorage.getItem('mdbook-sidebar');

                if (theme.startsWith('"') && theme.endsWith('"')) {
                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
                }

                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
                }
            } catch (e) { }
        </script>

        <!-- Set the theme before any content is loaded, prevents flash -->
        <script type="text/javascript">
            var theme;
            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
            if (theme === null || theme === undefined) { theme = default_theme; }
            var html = document.querySelector('html');
            html.classList.remove('no-js')
            html.classList.remove('light')
            html.classList.add(theme);
            html.classList.add('js');
        </script>

        <!-- Hide / unhide sidebar before it is displayed -->
        <script type="text/javascript">
            var html = document.querySelector('html');
            var sidebar = 'hidden';
            if (document.body.clientWidth >= 1080) {
                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
                sidebar = sidebar || 'visible';
            }
            html.classList.remove('sidebar-visible');
            html.classList.add("sidebar-" + sidebar);
        </script>

        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
            <div class="sidebar-scrollbox">
                <ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">Introduction</a></li><li class="chapter-item expanded "><a href="01-background/index.html"><strong aria-hidden="true">1.</strong> Background</a></li><li class="chapter-item expanded "><a href="02-requirements/index.html"><strong aria-hidden="true">2.</strong> Hardware/knowledge requirements</a></li><li class="chapter-item expanded "><a href="03-setup/index.html"><strong aria-hidden="true">3.</strong> Setting up a development environment</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="03-setup/linux.html"><strong aria-hidden="true">3.1.</strong> Linux</a></li><li class="chapter-item expanded "><a href="03-setup/windows.html"><strong aria-hidden="true">3.2.</strong> Windows</a></li><li class="chapter-item expanded "><a href="03-setup/macos.html"><strong aria-hidden="true">3.3.</strong> macOS</a></li><li class="chapter-item expanded "><a href="03-setup/verify.html"><strong aria-hidden="true">3.4.</strong> Verify the installation</a></li></ol></li><li class="chapter-item expanded "><a href="04-meet-your-hardware/index.html"><strong aria-hidden="true">4.</strong> Meet your hardware</a></li><li class="chapter-item expanded "><a href="05-led-roulette/index.html"><strong aria-hidden="true">5.</strong> LED roulette</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="05-led-roulette/build-it.html"><strong aria-hidden="true">5.1.</strong> Build it</a></li><li class="chapter-item expanded "><a href="05-led-roulette/flash-it.html"><strong aria-hidden="true">5.2.</strong> Flash it</a></li><li class="chapter-item expanded "><a href="05-led-roulette/debug-it.html"><strong aria-hidden="true">5.3.</strong> Debug it</a></li><li class="chapter-item expanded "><a href="05-led-roulette/the-led-and-delay-abstractions.html"><strong aria-hidden="true">5.4.</strong> The led and delay abstractions</a></li><li class="chapter-item expanded "><a href="05-led-roulette/the-challenge.html"><strong aria-hidden="true">5.5.</strong> The challenge</a></li><li class="chapter-item expanded "><a href="05-led-roulette/my-solution.html"><strong aria-hidden="true">5.6.</strong> My solution</a></li></ol></li><li class="chapter-item expanded "><a href="06-hello-world/index.html"><strong aria-hidden="true">6.</strong> Hello, world!</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="06-hello-world/panic.html"><strong aria-hidden="true">6.1.</strong> panic!</a></li></ol></li><li class="chapter-item expanded "><a href="07-registers/index.html"><strong aria-hidden="true">7.</strong> Registers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="07-registers/rtrm.html"><strong aria-hidden="true">7.1.</strong> RTRM</a></li><li class="chapter-item expanded "><a href="07-registers/optimization.html"><strong aria-hidden="true">7.2.</strong> (mis)Optimization</a></li><li class="chapter-item expanded "><a href="07-registers/bad-address.html"><strong aria-hidden="true">7.3.</strong> 0xBAAAAAAD address</a></li><li class="chapter-item expanded "><a href="07-registers/spooky-action-at-a-distance.html"><strong aria-hidden="true">7.4.</strong> Spooky action at a distance</a></li><li class="chapter-item expanded "><a href="07-registers/type-safe-manipulation.html"><strong aria-hidden="true">7.5.</strong> Type safe manipulation</a></li></ol></li><li class="chapter-item expanded "><a href="08-leds-again/index.html"><strong aria-hidden="true">8.</strong> LEDs, again</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="08-leds-again/power.html"><strong aria-hidden="true">8.1.</strong> Power</a></li><li class="chapter-item expanded "><a href="08-leds-again/configuration.html"><strong aria-hidden="true">8.2.</strong> Configuration</a></li><li class="chapter-item expanded "><a href="08-leds-again/the-solution.html"><strong aria-hidden="true">8.3.</strong> The solution</a></li></ol></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/index.html"><strong aria-hidden="true">9.</strong> Clocks and timers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="09-clocks-and-timers/for-loop-delays.html"><strong aria-hidden="true">9.1.</strong> for loop delays</a></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/nop.html"><strong aria-hidden="true">9.2.</strong> NOP</a></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/one-shot-timer.html"><strong aria-hidden="true">9.3.</strong> One-shot timer</a></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/initialization.html"><strong aria-hidden="true">9.4.</strong> Initialization</a></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/busy-waiting.html"><strong aria-hidden="true">9.5.</strong> Busy waiting</a></li><li class="chapter-item expanded "><a href="09-clocks-and-timers/putting-it-all-together.html"><strong aria-hidden="true">9.6.</strong> Putting it all together</a></li></ol></li><li class="chapter-item expanded "><a href="10-serial-communication/index.html"><strong aria-hidden="true">10.</strong> Serial communication</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="10-serial-communication/nix-tooling.html"><strong aria-hidden="true">10.1.</strong> *nix tooling</a></li><li class="chapter-item expanded "><a href="10-serial-communication/windows-tooling.html"><strong aria-hidden="true">10.2.</strong> Windows tooling</a></li><li class="chapter-item expanded "><a href="10-serial-communication/loopbacks.html"><strong aria-hidden="true">10.3.</strong> Loopbacks</a></li></ol></li><li class="chapter-item expanded "><a href="11-usart/index.html"><strong aria-hidden="true">11.</strong> USART</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="11-usart/send-a-single-byte.html"><strong aria-hidden="true">11.1.</strong> Send a single byte</a></li><li class="chapter-item expanded "><a href="11-usart/send-a-string.html"><strong aria-hidden="true">11.2.</strong> Send a string</a></li><li class="chapter-item expanded "><a href="11-usart/buffer-overrun.html"><strong aria-hidden="true">11.3.</strong> Buffer overrun</a></li><li class="chapter-item expanded "><a href="11-usart/uprintln.html"><strong aria-hidden="true">11.4.</strong> uprintln!</a></li><li class="chapter-item expanded "><a href="11-usart/receive-a-single-byte.html"><strong aria-hidden="true">11.5.</strong> Receive a single byte</a></li><li class="chapter-item expanded "><a href="11-usart/echo-server.html"><strong aria-hidden="true">11.6.</strong> Echo server</a></li><li class="chapter-item expanded "><a href="11-usart/reverse-a-string.html"><strong aria-hidden="true">11.7.</strong> Reverse a string</a></li><li class="chapter-item expanded "><a href="11-usart/my-solution.html"><strong aria-hidden="true">11.8.</strong> My solution</a></li></ol></li><li class="chapter-item expanded "><a href="12-bluetooth-setup/index.html"><strong aria-hidden="true">12.</strong> Bluetooth setup</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="12-bluetooth-setup/linux.html"><strong aria-hidden="true">12.1.</strong> Linux</a></li><li class="chapter-item expanded "><a href="12-bluetooth-setup/loopback.html"><strong aria-hidden="true">12.2.</strong> Loopback</a></li><li class="chapter-item expanded "><a href="12-bluetooth-setup/at-commands.html"><strong aria-hidden="true">12.3.</strong> AT commands</a></li></ol></li><li class="chapter-item expanded "><a href="13-serial-over-bluetooth/index.html"><strong aria-hidden="true">13.</strong> Serial over Bluetooth</a></li><li class="chapter-item expanded "><a href="14-i2c/index.html"><strong aria-hidden="true">14.</strong> I2C</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="14-i2c/the-general-protocol.html"><strong aria-hidden="true">14.1.</strong> The general protocol</a></li><li class="chapter-item expanded "><a href="14-i2c/lsm303dlhc.html"><strong aria-hidden="true">14.2.</strong> LSM303DLHC</a></li><li class="chapter-item expanded "><a href="14-i2c/read-a-single-register.html"><strong aria-hidden="true">14.3.</strong> Read a single register</a></li><li class="chapter-item expanded "><a href="14-i2c/the-solution.html"><strong aria-hidden="true">14.4.</strong> The solution</a></li><li class="chapter-item expanded "><a href="14-i2c/read-several-registers.html"><strong aria-hidden="true">14.5.</strong> Read several registers</a></li></ol></li><li class="chapter-item expanded "><a href="15-led-compass/index.html"><strong aria-hidden="true">15.</strong> LED compass</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="15-led-compass/take-1.html"><strong aria-hidden="true">15.1.</strong> Take 1</a></li><li class="chapter-item expanded "><a href="15-led-compass/solution-1.html"><strong aria-hidden="true">15.2.</strong> Solution 1</a></li><li class="chapter-item expanded "><a href="15-led-compass/take-2.html"><strong aria-hidden="true">15.3.</strong> Take 2</a></li><li class="chapter-item expanded "><a href="15-led-compass/solution-2.html"><strong aria-hidden="true">15.4.</strong> Solution 2</a></li><li class="chapter-item expanded "><a href="15-led-compass/magnitude.html"><strong aria-hidden="true">15.5.</strong> Magnitude</a></li><li class="chapter-item expanded "><a href="15-led-compass/calibration.html"><strong aria-hidden="true">15.6.</strong> Calibration</a></li></ol></li><li class="chapter-item expanded "><a href="16-punch-o-meter/index.html"><strong aria-hidden="true">16.</strong> Punch-o-meter</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="16-punch-o-meter/gravity-is-up.html"><strong aria-hidden="true">16.1.</strong> Gravity is up?</a></li><li class="chapter-item expanded "><a href="16-punch-o-meter/the-challenge.html"><strong aria-hidden="true">16.2.</strong> The challenge</a></li><li class="chapter-item expanded "><a href="16-punch-o-meter/my-solution.html"><strong aria-hidden="true">16.3.</strong> My solution</a></li></ol></li><li class="chapter-item expanded "><a href="explore.html"><strong aria-hidden="true">17.</strong> What's left for you to explore</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><a href="appendix/1-general-troubleshooting/index.html">General troubleshooting</a></li><li class="chapter-item expanded affix "><a href="appendix/2-how-to-use-gdb/index.html">How to use GDB</a></li><li class="spacer"></li></ol>
            </div>
            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
        </nav>

        <div id="page-wrapper" class="page-wrapper">

            <div class="page">
                                <div id="menu-bar-hover-placeholder"></div>
                <div id="menu-bar" class="menu-bar sticky bordered">
                    <div class="left-buttons">
                        <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
                            <i class="fa fa-bars"></i>
                        </button>
                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
                            <i class="fa fa-paint-brush"></i>
                        </button>
                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
                            <li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
                            <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
                            <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
                            <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
                            <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
                        </ul>
                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
                            <i class="fa fa-search"></i>
                        </button>
                    </div>

                    <h1 class="menu-title">Discovery</h1>

                    <div class="right-buttons">
                        <a href="print.html" title="Print this book" aria-label="Print this book">
                            <i id="print-button" class="fa fa-print"></i>
                        </a>
                        <a href="https://github.com/rust-embedded/discovery/" title="Git repository" aria-label="Git repository">
                            <i id="git-repository-button" class="fa fa-github"></i>
                        </a>

                    </div>
                </div>

                <div id="search-wrapper" class="hidden">
                    <form id="searchbar-outer" class="searchbar-outer">
                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
                    </form>
                    <div id="searchresults-outer" class="searchresults-outer hidden">
                        <div id="searchresults-header" class="searchresults-header"></div>
                        <ul id="searchresults">
                        </ul>
                    </div>
                </div>

                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
                <script type="text/javascript">
                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
                    });
                </script>

                <div id="content" class="content">
                    <main>
                        <h1 id="document-not-found-404"><a class="header" href="#document-not-found-404">Document not found (404)</a></h1>
<p>This URL is invalid, sorry. Please use the navigation bar or search to continue.</p>

                    </main>

                    <nav class="nav-wrapper" aria-label="Page navigation">
                        <!-- Mobile navigation buttons -->


                        <div style="clear: both"></div>
                    </nav>
                </div>
            </div>

            <nav class="nav-wide-wrapper" aria-label="Page navigation">

            </nav>

        </div>




        <script type="text/javascript">
            window.playground_copyable = true;
        </script>


        <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
        <script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
        <script src="searcher.js" type="text/javascript" charset="utf-8"></script>

        <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script>
        <script src="highlight.js" type="text/javascript" charset="utf-8"></script>
        <script src="book.js" type="text/javascript" charset="utf-8"></script>

        <!-- Custom JS scripts -->


    </body>
</html>
